Some bunnies are better about the litter box than others, especially with bonded pairs. It could be a variety of things and/or a combination. Does Oliver hog the litter box? Perhaps Lola chooses to pee elsewhere because he is controlling the litter box. I had that problem with a bonded pair (two boys). One would pee in another area because he was being excluded. Keep in mind that this isn’t always super obvious while observing them because the the “rules” have already been set, so you may not see blocking (for example). If you do see blocking, it can simply be one bunny gets into the box and the other hops in there with them and then crowds the first bunny. In other words, it may not be something that looks overly aggressive. If that makes sense.
Or Lola could be feeling territorial and marking. This is entirely possible too. Poop wars are no joke! LOL
Have you tried adding a second litter box? Or using a very large litter box (think under the bed storage box)? Sometime washable pee pads for dogs can help in these situations if the peeing is primarily in one spot, but it’s hard to put a litter box there.