When,i try to insert User to last row,then like a few seconds it disappear by itself?

[Tobi_D.Uchiha]

[Darren_Murphy]

Need more context please.

Is this the User Profiles table?
Is UserRole set as the Role column in the User Profiles configuration?

If yes, then the behaviour is correct and expected. Please refer to the documentation below (specifically the FAQ section):

Roles | Glide Docs