Not used offer shows much until recently but see that if you try to tip towards the end you cannot. Gets warning that cannot tip witnin the last minute. Noticed this again today with 1min 11secs to go.
Always having more credits in my wallet than the cost of the offer show, once the offer time expires and the show continues into "extra time" on the remaining credits in the wallet I still cannot tip and get same 1 minute no tip warning.
Is this normal or a fault? Quote

Hi PeteK. Thank you for bringing this to our attention. It should allow you to tip. I will have our tech team look into this and we will get back to you via email. Quote