Shower stall leaking water in the corner

My master shower is leaking water at the corner. I have tried to fix it myself one month ago. It only worked for 3 weeks then start leaking again. Should I find shower repair company to redo the stall? or should I just recaulk myself? I feel recaulk might not resolve the root issue. Any advice is appreciated. Thanks in advance

highlighted is the leaking area

I remove the grout which is detached from the stall

This is after I put new grout and I also put sealant on the new grout

Old grout is detached from the stall.