On startup with this mod (and it's osm-lib dependency) enabled with Klonan's Transport Drones mod, I get this error:

Error while loading recipe prototype "request-offshore-pump" (recipe): Difficulty normal: Value (455000.000000) outside of range. The data type allows values from 0 to 65535 in property tree at ROOT.recipe.request-offshore-pump.results.7.amount
Modifications: Transport Drones › Offshore P.U.M.P.S. and Ground Water

Oddly, if I also have the Alien Biomes mod enabled, the error does not occur. (Go figure, right? :P )

No idea where the fault is at with this.

Edit: Whoop, looks like it may have been reported before and I missed it: https://mods.factorio.com/mod/P-U-M-P-S/discussion/62e42d5d13719c2dcfb2f4d8

Edit2: Just posted over at Transport Drones, too, based on your older comment that you didn't think it was on your end: https://mods.factorio.com/mod/Transport_Drones/discussion/6402d43b3e72736f411f93a7