Trying to add $1,500 to my namecheap account.
Namecheap's add funds form for Bitcoins (screen prior to being directed to Bitpay) indicates:
Minimum $0.01 / Max $10,000.00/ Total Max Per Day $10,000.00/ Today $0.00
Entering any amount up to $500 works as expected. Click continue and bitpay order form shows.
Entering any amount >$500 (but less than $10,000) results in form being reset without error.
It looks like the issue is on namecheap's side but in chat they indicated it must be a problem with their payment processor.
If anyone from bitpay sees this you may want to reach out to someone who knows on namecheap's side.