@Marco: There was indeed a bug with the displayed amount of miners and hashrate for the pool on the web frontend (the values incorrectly included information from other pools) which has been corrected now. 

Here's the complete payment processing log for Block 761230:

[2017-10-28 16:30:01.5036] [I] [PayPerLastNShares] Balance-calculation completed with accumulated score 1 (100%)
[2017-10-28 16:30:01.5293] [I] [PayPerLastNShares] Adding 0.19411 DASH to balance of Xh5oWnZgzgRtC6qSSQVQfZL5CHgctaTTgE for 28900 shares
[2017-10-28 16:30:01.5408] [I] [PayPerLastNShares] Adding 0.3938 DASH to balance of XbirKVQ8iVs9iGv8tN3ZTPLPaiHreTVYqE for 59446 shares
[2017-10-28 16:30:01.5911] [I] [PayPerLastNShares] Adding 0.07555 DASH to balance of Xy7BgJD6UCyTUwTYqQzr2vMyL6B4V4DPvi for 10746 shares
[2017-10-28 16:30:01.6056] [I] [PayPerLastNShares] Adding 0.2532 DASH to balance of XeE863rqgVLTBrE2eDWkpq3m7KzbdcYU1f for 38810 shares
[2017-10-28 16:30:01.6203] [I] [PayPerLastNShares] Adding 0.00179 DASH to balance of XkkA4JqYmekdBoEjBhAnuFxWqsmUk1uWwd for 194 shares
[2017-10-28 16:30:01.6758] [I] [PayPerLastNShares] Adding 0.00108 DASH to balance of XfftbJdExNvfjLV6S7wgQJsB9BrKv6vstk for 78 shares
[2017-10-28 16:30:01.6943] [I] [PayPerLastNShares] Adding 0.00042 DASH to balance of XhnJDaruB1zAMFwjXmZRVTKLQfHxiPRR27 for 42 shares
[2017-10-28 16:30:01.7194] [I] [PayPerLastNShares] Adding 0.22057 DASH to balance of XyTaexB4LnndFF9wQEVuVWC7qacnT6b1uL for 30862 shares
[2017-10-28 16:30:01.7475] [I] [PayPerLastNShares] Adding 0.04209 DASH to balance of Xp6bK4UKh7zwXks1TBgt9HGLgnz5vMdgKB for 7876 shares
[2017-10-28 16:30:01.7834] [I] [PayPerLastNShares] Adding 0.32892 DASH to balance of XomXz9aQgBvJkY8WWvvfGsNmefwhiaeUHc for 10529 shares
[2017-10-28 16:30:01.7928] [I] [PayPerLastNShares] Adding 0.00111 DASH to balance of XvzhNipVHAPF8rfP4jeQA459fgWvDe5Aud for 126 shares
[2017-10-28 16:30:01.8377] [I] [PayPerLastNShares] Adding 0.00017 DASH to balance of XgwYSnC7wkuj2oeKKVMCB7YJtmeGq7rvo4 for 25 shares
[2017-10-28 16:30:01.8823] [I] [PayPerLastNShares] Adding 0.00042 DASH to balance of XiAgyvR9b78gAYhSmNNfhnP8C1fiV3piH5 for 47 shares
[2017-10-28 16:30:01.8869] [I] [PayPerLastNShares] Adding 0.00014 DASH to balance of XfCNMA8ydvudG1XyF18yAxvEfVmaPNtRy3 for 13 shares
[2017-10-28 16:30:01.9149] [I] [PayPerLastNShares] Adding 0.00001 DASH to balance of Xo8iWDxQm57wFgAt7aFfxoVhdrTgnCUW4Q for 1 shares
[2017-10-28 16:30:01.9149] [I] [PayPerLastNShares] Adding 0.00081 DASH to balance of XwArE5219EFEibU9XxwQwbgh8oBrWZU7Qv for 104 shares
[2017-10-28 16:30:01.9149] [I] [PayPerLastNShares] Adding 0.00038 DASH to balance of Xo4VNqHiTXJH9wzTxqxEdy9obiHpK1EHzR for 12 shares
[2017-10-28 16:30:01.9149] [I] [PayPerLastNShares] Adding 0.19415 DASH to balance of Xv262qxWYasMwaLtFQEWsns7eS61m26Qoq for 1540 shares
[2017-10-28 16:30:01.9149] [I] [PayPerLastNShares] Adding 0.05929 DASH to balance of XshF4uevDpJ2P2ta4RtR845V3GUZvqHunq for 530 shares
[2017-10-28 16:30:08.0820] [I] [PayPerLastNShares] 189881 shares contributed to a total payout of 1.76803 DASH (100.00% of block reward)
[2017-10-28 16:30:08.5314] [I] [dash1] [Bitcoin Payout Handler] Paying out 1.73786 DASH to 7 addresses
[2017-10-28 16:30:08.6576] [I] [dash1] [Bitcoin Payout Handler] Payout transaction id: cd2b5a1c212a7f80521aa86054c448518f111b9f33a5e33156731ae10ce6c18d

I will continue the investigation tomorrow morning. I'm simply too tired right now.

Checking.

Are you referring to the block reward or your payout?

Well, you either trust the pool or you don't. Even if that information would be included in the reports, people could still accuse the pool of faking these metrics as well. I can tell you that we are working our asses of providing a good mining experience to everyone and we don't have the slightest interest in angering and ultimately losing loyal miners by doing shady stuff with the payouts to cash in on a couple dollars. I'm currently in contact with a fellow pool operator and we will go over the logs tomorrow. If there are any irregularities caused by a software bug, people will get compensated.  

@Ted: As I've already wrote in response to your private ticket: Total recorded difficulty for the block was 14600000 for 232210 shares contributed by all miners. Of which you contributed 11024 shares with a combined difficulty of 484175 which equals 3.31% of the work for the block. What kind of payout do you expect for that?

Fixed and deployed.

Thanks for reporting that. Fix on the way.

Hmm that is already implemented. Perhaps the browser is blocking the cookie?

Thanks a lot for your help.

@happyserendipity: Could you also send your log file?