LinkedIn Senior Software Developer interview questions

I have been interviewed by Linkedin before, this time they reached out me again. Still same process, one phone interview, it went well, then on-site, two coding, one tech communication, one system design, one behavior analysis. I didn't get offer, this is OK for me. But the feedback is weird, which is I am strong in system design and tech communication, but weak on algorithm. But thing is what the interviewer asked I've practiced in leetcode, I am pretty sure my solution is correct. I also put the solution in my GitHub repo. I guess for coding part, this company should have a score system instead of someone said it's right or not. Otherwise this is wasting people's time.

-- 2 Telephonic rounds. First telephonic was kind of profile related discussion with hiring manager. Second telephonic was codepad coding round. -- Scheduled f2f in the following week. Recruiter told me that there will be total 5 rounds but they did only 3 interviews and rest of the time I was idle waiting for the interviewers. Recruiter did not update on the progress. Full day got wasted. -- I got the call from recruiter almost after 2 weeks to schedule another telephonic. Finished this telephonic round in the following week. -- No update/feedback from recruiter for next 3 weeks until I mailed them and asked for it. Overall, I felt the sense of unprofessionalism.