With MBS FileMaker Plugin 4.5 we reorganized the IDs in our plugin. Now you can see from the ID where it came from. So ID 14012 is an email. Except if you used more than a 1000 regular expressions and also reached that ID there. But in general we don't expect a lot of people use the plugin so much until they restart FileMaker.
|CoreGraphics Image Source||25000||text|
|Drag & Drop||31000||number|
As you see most IDs are nowadays returned as text and not as numbers. If you just keep them in variables, things should go right. And for storing in fields, simply use text fields. Storing them in number fields may also work as long as you later read the numbers without dot and decimals. "12345" will work, but "12345.00000" may not.