Before you panic try things in this order:
Step 1. Hold food constant and exercise more. Measure. If down keep doing what you are doing. If not move to step 2.
Step 2. Reduce calories consumed by 200-350 calories per day and keep new higher level of exercise. Measure. If down keep doing what you are doing. If not move to step 3.
Step 3. Increase exercise more and reduce calories a little more. Measure. If down keep doing what you are doing. If not move to next step.
Step 4. Estimate Base Metabolic rate using standard equation (find this on the internet easily) and add on estimated calories expended with your exercise routine using widely available calcuators, add up calories consumed on a daily basis. If you are not getting a calorie deficit of about 500 cals per day make that happen and measure. If you are down keep doing what you are doing. If not go to next step.
Step 5. Enlist professional help (from suitable qualified personal trainer) where actual BMR is measured. Do another 7 days of recording food intake and submit for further analysis. Often this focus of enlisting help, i.e. investing money makes things a little more accurate! Measure. If down, keep doing what you are doing. If not go to the next step.
Step 6. See nutritional medicine practitioner to see if there are food allergies and or likely thyroid issues. This type of issue would normally be identified at this point and appropriate action taken.
However, think simple first folks. The solution will usually be found there.