Problem with deleting codes

So, I got this annoying problem - some sort of automatic deletion which for the more experienced people might be nothing but for me ..well i just cant delete or change stuff from codes without deleting the whole code.

Instead of having "|" (the symbol you have even right now when you type something- the thing that shows where your going to type or what your going to delete etc)
I have something like this █ although grey.

For example if i have (completely random pickd)
Cold tea
And i try to add "green" by clicking between the 2 words and start typing
the new word will eat "tea" instead of simply goin between them..
you probably have pressed the insert key on your keyboard.
That solved my problem.
Thank you, very much!
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