MRP issue on creating duplicate PR so the stock has increased.

Hi,

For example,On 26.02.19 MRP has Run.It has generated PR for 3 materials since we had stock of 8 materials and maximum stock that should be is 11(11-8).

On 27.02.19 MRP has run .it did not create PR because there in so shortage in Maximum stock quantity.

On 28.02.19 after MRP it has created the same 3 quantity of materials .why did the duplicity had happened?

Note :there is no open sales order also between those dates also.

we run MRP through batch.Planning mode is 1.

Please help me fix.

Thanks!