Mine do that when I put them in the wrong place in my room. Move them a few inches.

I've had them for a while now. I know of 2 places in my room where I can not put my M60s. In one spot, they sound bright as all get out, in the other they sound all muddy.

There are about 50 good places though!

Try a little less toe in as well.

M- M60s/VP150/QS8s/SVS PC-Ultra/HK630 Sit down. Shut up. Listen.