hey this happens a lot to me.

just rolling and spenndig mats but nothing happens. so i wreck the item couse im pissed.

and sometimes happens something VERY anoying!!:

when you go back to the brige, items get back  the stats they had befor your spennd resources worth 2 planets to get the right roll.

i found a solution for that. 

log out. log in. Magic happens.

but if you do a mission it will stay that way and your materials are gone.

the "reaction time" of the game is to slow some times. 

i feal like some other issues came from that too. 

you do something = game says "nothig happend here!.... wait! what?  ....ahh too late..sorry my bad!"

With blue enchantment, you mean the blue lit up square in front of the enchantment that indicates it's a better enchantment than the common ones?

I've never had any issues but possibly the enchantments for that slot are limited or is one of a kind so you can't get different enchantments. I don't know that weapon though as I haven't used it myself.