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We have a website which had a previous memory limit of 12 MB (12 MB in php.ini, and 16 MB in settings.php) and worked previously.
After moving to a new server it started giving memory limit errors and displaying half-blank screen.
We increaded the limit in both files (php.ini and settings.php) and now it works, but I dont understand how is it possible that now it needs a considerably larger amount of memory (it used to work with 12 MB, now it cont work with less than 20 MB).
I assume you did not change the OS in the process. Moving from Windows to Linux or vice versa is quite likely to change resource usage.
And this is a long shot, but perhaps you moved from a 32-bit system to a 64-bit one? This would slightly increase memory usage as addresses (pointers) are twice as large on 64-bit architectures, and code with lots of small objects uses plenty of pointers.
On the whole though, we can’t tell you much without seeing what changed about the system.