Try removing and re-adding the mint. That should help.
After clearing cache on Minibits it just started working consistently, I've been able to swap back and forth without issue.
Unfortunately not the case with nostr:npub1xnf02f60r9v0e5kty33a404dm79zr7z2eepyrk5gsq3m7pwvsz2sazlpr5.
Even if I just try to withdraw a couple sats it still states not enough funds to cover payment 🤔
Discussion
Doh!
That did it, much appreciated as always.