In other news... I notice you are suffering from the same problem I was in your round stats page. While the following won't address your current rounds, it will fix your future round stats.
Log into your database and execute the following statements:
alter table statistics_shares modify pplns_valid bigint(20) not null;
alter table statistics_shares modify invalid bigint(20) not null default 0;
alter table statistics_shares modify pplns_invalid bigint(20) not null default 0;
The problem was that the standard MPOS structure had those columns defined as INT(11), meaning the max value is 231-1 i.e. 2147483647 - look familiar?
Anyway, I also had that PR merged into MPOS on github so future installs won't suffer the same stats issue.
Thanks. That was one of those things you do not even realize that is wrong till you find a few blocks.