INFOPATH problem with integer number

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C#

InfoPath

Hi,
I have big issue with integer numbers which are stored in one Share Point 2010 document library's column. On opening Infopath form that uses the number from listed column, number is changed and form becomes unusable. Example: number value in column is 2553, and when is opened becomes 2553.00000. Now is impossible to make any changes on Infopath form, because number is written in wrong format.
I have few remarks:
- The field isn't modified to use decimal format (it uses integer format).
- Column in SharePoint library is Number (1, 1.0, 100), with 0 decimal places.
- Niether the round and floor functions can't fix the problem.
Does enyone have clue what could be the problem?

Thanks in advance.