Please attach the hand history file for that session (or any session which shows the problem) to a Support Ticket so that we can check it out. Please post the ticket number here so that we can follow this up ASAP. Thanks
This appears to be a seat numbering issue. 6-max tables do not use seat numbers 1 to 6, they use 1,2,3 and 8,9,10. Similarly their 9-max tables use seat numbers 1 to 10 and miss out 6 - at least, it's 6 in this example so we'll need to check if these numbers are consistent.
Thanks for bringing this to our attention - I'll make the development team aware of this.