Over several months now a new LoRa shield has replaced the old one. New shield is recognisible by its format: it is shorter.
Unfortunatelly LoRa library V3.0 can have some problem with old shield, even if people leave jumper JRST open. (Because inverse reset level).
So, if you are still using older LoRa shield you can dounload a sort of patch of versio 3.0. This LORA30-update.zip contains two files thayou have to substitute into the library and a text of explanetions. With this update you can use both shields just comment a couple of "define" statements. (See V30 release)