[No glue masher schematic]

I believe you get the glue masher schematic from beating the boss in the sandbox and getting the super chip and aux chip in the sandbox location.

[Stored items Losing Health]

This is because of the newest update, do not worry! It's because mostly all gear and items durability have been doubled! So they pretty much doubled the durability bar, and it's only at half health! No need to fret!