Definition of LastTestedTimestamp in TorBEL export data format specification is unclear
TorBEL's data-spec.txt says that there can be more than 1 entry for each RouterID. This happens when a router was found to exit via different IP addresses for different ports.
The specification does not specify whether all lines belonging to the same RouterID contain the same LastTestedTimestamp or not. Technically, it's the time when "TorBEL last completed testing this node's exit policy" (Section 1.2), so it should be the same timestamp for all lines with the same RouterID. Not a big issue, but maybe the spec should say what behavior one can expect here.