JOSM Conflation plugin, discordant distance

Hi, I’m learning the mechanics of the JOSM Conflation plugin. Is normal that the plugin distances do not match if I measure it? example:
The red line, hand-drawn to verify, tells me ~69 meters but
the cyan one, plugin match , tells me that it’s ~92 meters

Am I misunderstanding something?

(Deleted my post) because you are absolutly right. The distances are differently.