In the original ME1, Level 50 was the cap for your first playthrough with Level 60 only attainable on New Game Plus.
In the remastered ME1, there is no level cap. The Legendary Edition also includes two leveling systems. A "classic" mode with 60 levels based on the original and a new "legendary" mode with 30 levels inspired by ME2 & ME3. Both are suppose to give the same number of skill points and can be switched to and from in the options.
However, some players are encountering a BUG where they reach Level 29 (on Legendary mode) or Level 59 (on Classic mode) and no longer receive XP. This makes reaching Level 30 (Legendary) & Level 60 (Classic) impossible for them.
The cause of the glitch is currently unknown and there are no known workarounds if you're affected. A few have theorized that switching between legendary and classic leveling mid-playthrough might be the cause. Although, at least one player did not switch between modes and was still hit by this glitch. There is also a discrepancy in how points are distributed between both leveling modes where they don't line up exactly where they should. All of which might also contribute to this bug.
Here's an image of an affected character, courtesy of u/Daemeos on the Mass Effect subreddit.
And judging by reports, it seems to affect all platforms.
