the default skin,aka''factory issue''skin,can't overwrite any other skins.

Product: Apex Legends
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number RTX2070
Enter RAM memory size in GB 32GB
What is your gamertag/PSN ID/EA Account name? CONFU5ER_HY
Please provide your squad mates' gamertag/PSN ID/EA Account name if possible.
Are you using any software with an overlay? No
Which Legend were you playing (if applicable)?
Which Legends were your squad mates using (if applicable)?
Where did the issue occur? In a match
Which part of the map or menu were you in? If you don't remember the exact name, please describe the area or what you were trying to do in the menu. In every places
What were you doing when the issue occurred? E.g. respawning a squad mate at a beacon, using an ability, a squad mate left the game. Once you pick up a weapon and its skin are not “factory issue”
Did your squad mates also experience the issue? Yes
How many matches had you played in a row before the issue occurred? It doesn’t matters matches had played.
When did this happen? (dd.mm.yy hh:mm) in game
How often does the bug occur? Every time (100%)
How severe is your issue? Major impacts to gameplay
What happens when the bug occurs? *My English is not very good,but I will try to make this easy to understand. If I select to use the “factory issue” skin and no charms equiped on it,then once I pick up a weapon with other skins,I can't overwrite "factory issue" skin to this weapon I just picked up.(no matter it's in death boxes or on the ground). For example,I equiped the "factory issue" skin on vk-47 and no charms on it.Then,in match,I pick up a vk-47 that someone else dorped on the ground with any other skins except "factory issue".Then I open my backpack,and there's no botton there to let me overwrite this weapon.
What should be happening instead? the default skin,aka“factory issue” skin,should like any other skins,as a unique one. the “factory issue”skin should have that overwrite button to overwrite any other skins.
Steps: How can we find the bug ourselves? once equip “factory issue” skin in load out,it occurs.

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In specific case(the weapon you picked up has a charm on it）

In this case,

the “factory issue” skin is able to overwrite.