Query about private PF trust

I 'm working in private MNC IT company where they deduct PF both share from employee & company has own trust.

I found the some mismatch of PF interest, query as below:

1)  8.65% in 2018, such an interest get on both employee and employer share monthly basis compound interest ?

For Ex. Total share of employee and employer is Rs.4400 (equal share). then end of year interest would be ₹2,309.53 for 12 months.

2) If employee leave organization & then after employee withdraw PF after 1 year,  in this case we get interest between left origination to withdraw date ?

Thanks in advance