Known Issue - FPGA Timekeeper 1.1b0
The "LabVIEW Time to FPGA Time.vi" casts LabVIEW time to double precision floating point. This results in loss of precision when converting to FPGA time: NI TimeSync: FPGA Timekeeper 1.1b0 library precision error - NI Community
Attached "FPGA Timekeeper 1.1b1.zip" resolves this issue by using extended precision floating point numbers.
Note: The updated version of "LabVIEW Time to FPGA Time.vi" is saved in LabVIEW 2021.