I dont understand what you mean here.
Issue is not confirmation of transaction, but fees (I paid around 4% fees).
How much in BTC did you sent?
ChipMixer works with chips of fixed amounts. There are chips of 0.002, 0.004, 0.008, 0.010, etc... this means that if you send, for example, 0.0023, you will receive the chip of 0.002 and the difference of 0.0003 wont be redeemable (acting like a donation/fee) simple because there is no chip of 0.0023 BTC.
You probably sent something like 0.0103 and received the chip of 0.01, losing the 0.0003 (~$2). (These numbers serves just as an example)
so where to see EXACTLY which chips are available? Yes this is what exactly happened.
I can't see it on the website.