Hi i am unable to close or open the shower door. I need to lift the door a bit up and then close. Need to follow same technique to open. Lifting up is real hard. Below is the bottom part of shower door

Upper part of shower-

I am looking for a way to fix it. One thing I found was on my other shower door there was a black bush kind of thing which is missing in ensuite shower ( the door that has issue)

Any suggestion is highly appreciated.