Unfortunately, This is a bug in libreoffice which causes separated numbers to appear Left To Right even If you are using RTL direction. It appears also in:
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Date: 22/2/2014 The result should be reversed in RTL (2014/2/22)
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Dot separated nubmers (Your problem)
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Dash separated numbers (1-2-3-4)
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Plus separated nubmers (1+2+3+4)
etc…
Update:
The only workaround I know is to change the separator (Edit - Fields) to a character that doesn’t have the bug. If you need to keep the same separator (dot), You can choose another dot from Unicode map such as U+2024 ( ․ ). (Credit to Safa from #LinuxAC who just discoverd this character)
If you have this problem in other cases, You can simply insert a space before or after the separator.