The difference in the method for calculating Average Buy Price (ABP):
On your broker platform, the ABP is calculated using FIFO (first in, first out) for tax liability
On smallcase, the simple average method is adopted for accuracy purposes
Stocks in smallcases sold directly on the broker platform:
When you sell stocks in your smallcases directly on your broker platform, the same doesn't get updated in your smallcases. Hence, causing a mismatch in holdings and returns.
If you have already sold the stocks directly, you can try reconciling your holdings by clicking on the shortfall detected banner on the smallcase platform.