Level issue:

A few weeks back, i had level 27 (it is still showing for me in SinglePlayer battles), now i logged in, and i have level 16, and cannot even use some equipment i bought before. No idea if it is supposed to move everything back for few levels but yeah.. Creeps me out a little.
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Equipment selling issue:
I've bought something in the workshop, to exchange it for the old equipment i had, but i cannot sell the old stuff, nor can sell anything in the workshop?
Just wondering if it is supposed to be un-sold-able or if it's a bug on my point..

Thanks for any response.

There was recently a big update in SM. This is the forum link that explains everything.

viewtopic.php?f=403&t=26904

In short, you cannot sell weapons anymore, but you can fuse them in the fusion core to increase the power. After the power has become high enough your gun with "level up" and have +1 damage point (from what I've seen). You can also fuse torsos and legs.

Theres a lot more than just that so read up (: