Leela suggests a blunder

In this position:

r1bq1rk1/pp3pp1/3b3p/2pn4/8/P1PQ1N2/5PPP/R1B1R1K1 w - - 0 1

Leela suggests Qxd5 for white. I ran for 30 seconds on GPU with various nets and they all gave that move

Why is this?

The short answer is that the engine is imperfect

It’s possibly because Leela believes the position to be so clearly lost whatever move is played