It should be said that your training intensity is no problem. But what you need to know is that muscle growth is not so fast, because from a physiological point of view, muscle growth usually occurs after 2 months, and you will experience strength growth in the first 2 months, but that is mainly because the nerves adapt to the stimulation of strength training rather than muscle growth. What you said about losing weight may be the reason why your constitution is sensitive to exercise. And the increase or decrease of weight does not represent whether your muscles have increased or decreased. Maybe you lost some fat. So you just need to keep training and you will always see obvious muscle growth.