This happens to me alot, and im trying to find the answer to why 185 bench or squat would feel heavier then when I bench or squat 225.
Why would this feel this way to me?

to me when the weight is kinda light but not very light it actually hurts my joints more. I don't know why but it does. But when I go heavy I don't feel joint pains anymore. But that only happens to me, well mostly, on squats.
I don't know the science behind it though, sorry. Hopefully someone on here can make an input on this.
I'm on 100g of carbs/day...in other words, ATM, I am not a very happy person :/
I imagine you're not warmed up enough yet/warmed up properly.
When your warming up your still getting acclimated to the weight
Agreed with the above posts
ACSM-CPT
With everything but heavy legs, I not only warm up, but I like to do a single with my working set then rest briefly before actually doing the set. I've found this has helped me tremendously with my progress especially on a calorie deficit. I guess it's a way to make extra sure I've warmed up, though it also helps offset any CNS burnout effects, too, allowing me to put off a deload so to speak (it's always psychological to me, I dont get joint problems).
EDIT: my heavy squats aren't so heavy anymore LOL ;( but I'll get back up in time. I just feel that if I do 1 and rack it, I wont want to do it ever again that day.
It's focus. Most training injuries in PL'ing happen during the sub-maximal weights because you're not treating them properly. Hell, the worst hamstring injury I've ever had was a direct result of this same thing about 4 years ago. I was working up to a set of 405 on deads and was just going through the motions in my warm-up sets. At 315, I still was nonchalant and ended up straining my hamstring bad enough to where it took over 6 months to properly heal.
M.Ed. Ex Phys