Is a cut of 1400 cal too little

I started losing weight 2 months ago at 6’1 190 pounds I started my deficit at 1000 cal and moved it up to 1400 after a few days. I am down to 180 and I’ve been eating around 100-160 g of protein a day in the 1400 cal range but for the past week I have been weighing in at 180 every morning 180 pounds. Today I thought for sure it would be under 180 nope 181 it’s making me pretty mad but I am in the gym everyday doing cardio and lifting weights. I’m trying to get down to 150-160 but I’m not sure if I should be in taking more cal or what I’m doing.

I mainly have 2 questions.

Why did I lose so much weight when I first started and then I hit 179 and jump up to 180 for a week

Is 1400 not enough for me and will I lose weight about the same or faster eating more cal.

I want to hit 150-160 in June or July.