A once and for all solution would be to set your fee rate dynamically using "estimatefee" command.
We do use the estimatefee. However we use confirm target of 20 blocks and it doesn't always work correctly with such a high target. I see that today's transactions are getting confirmed correctly though.
I'm trying to protect somehow my faucets against bots .. unfortunately poorly it goes.
Changing captcha system every week can be good enough? Any other advice?
Do FaucetBox have plans to introduce some additional security?
There's nothing you could do that I'm aware of. Captcha + timer is pretty much the only way.
Did not help, maybe there are other ways?
It could be something to do with the language set in your MySQL database. I'll wait for Kazuldur before suggesting anything else though, he probably has a better idea than I do.
Thanks, I will wait for new ideas. I wrote to support, got no response, but I hope they will answer.
Did you try reentering everything after doing what
minifrij suggested?