The RG score is not an absolute number, it is a percentile value relative to other members scores (higher than x% of all ResearchGate members’ scores). Thus it can also decrease based on other's performances, even if your own Total Research Interest increases.
Aparna Sathya Murthy so how do you suppose it is being checked whether your anwers to a question is valid - and good (not just bla-bla and also right)?