Resource Glitch?

Quick question...

Just raided someone - he showed 5.9k de available.
I took TH, de storage, clan castle and two drills out.

This left him one drill. After the raid, it showed I'd left him with 1.35k de.

It was a max drill - so capacity is 1800 but I thought you could only take 50% de from drills or am I mistaken.
If true, did clash just rob me of some de I've earned? :mad:

(This was a TH10 vs. TH10 btw).

Thanks in advance.

75% on drills
50% on mines and collectors

Maybe the 1350 left is correct then... seems about right... Thanks.