Yes, it could be calories, and other factors. The ultimate factor in fat loss is creating a deficit by consuming less calories than you burn. This can be done through nutrition, cardio, and typically both.
So, the deeper the deficit, the more aggressive the approach. For example, you could create a 10% deficit under maintenance and toss in a couple of cardio sessions a week, for a slow and steady type approach, or you can create a 20% deficit and toss in more cardio, maybe some low carb days, etc., for a more aggressive approach.
Keep in mind though there are many factors to consider, and just by creating more a deficit, does not mean you’ll keep getting leaner. As an example, in both my first and second contest seasons, I reached a point in my prep where I was adding more and more cardio, less and less carbs, assuming it would get me leaner. While these methods worked for a time, eventually I got to a point where I stalled. I was doing 2 hours of cardio a day, plus weights, and low carbs and cals. So, knowing I couldn’t possibly do more cardio or take out more cals and carbs, I wound up cutting back on cardio, raising cals and carbs a bit, a lo and behold, I starting losing again, muscles looked fuller and tighter and the progress kept coming. For my last show of this year I actually wound up eating MORE going into the show, because I was low enough on carbs and was doing so much cardio that my body just started slowing down, and I needed to kick start my metabolism again.
I would imagine it’s a possibility you could be in the same boat, especially if you’ve been on these macros for 3 months. You’re eating 1770 cals a day, while lifting heavy 4 days a week, AND climbing. So, you may find that by lowering protein and adding carbs, and even upping overall cals, your abs and upper body will look tighter and you’ll continue to get leaner.
Understandable, but remember, the body is always trying to achieve homeostasis, so whatever method you try that “works” will only “work” for so long before the body adjusts and you need to throw some new stimulus. As @The_Mighty_Stu likes to say, “everything works, but nothing works forever.” So, you can’t assume that because you got results with your current macros, they’ll keep coming, they will not. The body will adjust, and then you need to make some tweaks to keep the progress going, and again, that does not always mean lowering cals/carbs and adding more exercise. Quite the contrary. If you’ve been dieting long enough, often times, eating less and exercising more will only make things worse.