This is not a feature in Magic Storage; it does not happen with only this mod enabled.
This is almost certainly due to a mod conflict.

Disable half of your mods via the Manage Mods menu, reload mods, check if the issue still happens, then repeat until it stops.
Then, re-enable the mods you had just disabled one-by-one until the issue starts happening again.

If you can figure out which mod is causing the conflict, please do let me know in this discussion.

I figured out that it conflicts with the arrow inventory mod. Link below(if I put the correct link in.)

https://steamhost.cn/steamcommunity_com/profiles/76561199206623214/myworkshopfiles/?appid=1281930&p=2&numperpage=30

I think this problems happens when you place the Storage window in the center of the screen, so when you click to open storage, it opens and insta-click on the item where your mouse is.

Originally posted by Khaelyn:

I think this problems happens when you place the Storage window in the center of the screen, so when you click to open storage, it opens and insta-click on the item where your mouse is.

I never move the window for Magic Storage, as it aligns with the standard crafting window and is easy to use. It was just the arrow inventory mod royally messing with the inventory interfaces in general: none of the item tool-tips were showing, the aforementioned auto-collection glitch in ANY storage device(not limited to the Magic Storage after testing, but as I only use magic storage I thought that it was a feature).