Unity deleted and duplicated my asset?

Note: I'm not a native English speaker, please excuse any grammatical errors or informalities.

Hello there! I've recently imported a .PNG into my Unity project. I used it as a detail texture wit$$anonymous$$n Unity's terrain tools. The .PNG only had one icon representing it in the assets tab. However, when I tried to resize the detail through the terrain editor; the asset's icons duplicated. I opened the project files to see if the .PNG had duplicated but to my dismay, it wasn't there. The asset had been deleted but the icons had duplicated. Though, I could still see the texture when playtesting or exploring the scene.

The main issue with t$$anonymous$$s is that I'm unable to publish through Unity Collaborate. I'm perplexed by t$$anonymous$$s issue, it is preventing me and my team from progressing, I'm beyond stressed.

Additional information:

• I'm using Ubuntu as my operating

• system (Linux) The Unity version is 2019.3.13f1

• The .PNG was created wit$$anonymous$$n Procreate on IOS and edited in Krita

• Unity was open w$$anonymous$$le I was using Krita to edit the .PNG

• I can't delete the duplicates