28-30 day cycle. took clearblue digital ovulation test (not advanced), & had lh surge detected on day 8 and 11. why multiple days? & so early?

Variable: Ovulation tests must be done daily at the sam time and with making sure that you have the same urine concentration. A more concentrated urine will give you false positive ovulation test. so, please repeat it again daily till Day 16 or till it is consistently positive. In a 28 to 30 day cycle, you are most likely to ovulate Day 14 to 16. Please start testing only from Day 12 of your cycle next time