I'm not here consistently, just drop in now & again now that mine are in high school, but I did notice your post.
Looks like you're in the 2-to-1 changeover, so for a while there will likely be days when one nap does the job and others where one nap is short and two are needed. (This will likely happen again when it's time to drop the nap entirely, BTW: some days nap, other days no, until one day is the last nap except for a sick kid who SLEEEEEEPS.)
Looks like you generally get better night sleep, at least looking at this, when there's one longer nap, so I'd *try* to aim for that when possible. Sleep begets sleep: better night sleep means not Ot during the day so more settled naps, which in turn leads to more settled night sleep.
There may also be some teething going on at this age, so trying pain meds before sleep time might make a difference. 14 months is when we started w/canines with my DD#1 and they were miserable for her, lots of interrupted sleep. (Later on it occurred to us to do a "dream med" like a dream feed, but by then her teeth were pretty much in.) Might be worth a try.
Good luck - hopw this helps!