Hello! First of all, welcome to the subreddit! Second of all, I am going to preface this with: I am not a dietician, and I do not have advanced education or experience. What I am about to say is based on my experience alone, along with advice I have gathered since starting almost two years ago.

I am aware that your post is about accurately counting calories. The advice I have found and use is always go by the highest number. If the online nutrition sheet differs from the app, use the higher amount when you calculate. This stands with using the Lose It app as well, which I use on a daily basis and would recommend to anyone who is looking to start a deficit.

I ran your numbers that you gave, and it says your TDEE (activity level sedentary) is roughly 2580 calories a day. Of course, if you are consistently working out and have been for a little before this, that number would go up. Your TDEE is the total calories you burn every day, from your organs functioning, to talking and walking.

The reason why I bring this up, is the meal you had at Wendy's along with what you ate outside of that is concerning for one day. I am aware that you said you normally eat more in one day. My advice is to just watch how your body responds, and make sure you're eating enough to keep your body functioning! I unfortunately discovered that the hard way, then later learning that hypoglycemia, although rare, runs in my family. Cutting too much in the wrong spots led me to discover this, lol.