This is a known issue that affects the Video Scaler v8.0, v8.0 (Rev. 1), v8.1 and v8.1 (Rev. 1).
This issue happens when the coefficients contain negative numbers and the MEMORY_INITIALIZATION_RADIX = 10.
You can work around this problem by using binary or hexadecimal coefficients and updating the radix in the COE file to:
MEMORY_INITIALIZATION_RADIX = 2 or 16