Lightning help please!

Opened a channel with Boltz.

Started with 1,004,194 sats

Moved 371,696 to other side as inbound liquidity

Send potential 627,644Receive potential 371,696

Ok cool.

Send 371,000 sats to my account = fail

Send 300,000 sats success

But now inbound is down 300,000

sending account down 300,000

and receiving account up 300,00

Seems 300,000 is missing along the route.

What am I missing?