there is no limit how many plugins you can install. I assume you’re on Linux.
Is the plugins directory empty except for the .jpi files?
I would run a checksum on the jpi files and compare that to the checksum on the instance where you have no issues.
Also when you say you downloaded again, did you update the files in your internal repository? Maybe they are already corrupted there.
Is Failed to expand <jenkins home>/plugins/<plugin name>.jpi the only error message or is there a stacktrace attached?
Might be good to post the complete jenkins log