findAny() some times founds target and sometimes not

Hi Team,
Thanks for support.
Am using SikuliX 1.1.3.
Using findAny() functions in my code many times. Not getting match all the time for the specified target.
Same piece of code works well in other part of implementation.
I tried by setting match from 80% to 95% as well.
Is there any way to get 100% match with findAny? Or other functions.
--------------------------------------------------------
source_check() # Works well.
new_reg = findAny(Pattern("1567587221899.png").similar(0.85),Pattern("1567582102585.png").similar(0.85))
    for match in new_reg :
        match.highlight(1)
        uprint(match.text())
if hostchk == "Connectedto":
        print "Valid Host"
    else :
        wr_sheet.write(rx,23,'Invalid Host')
        type("quit" +Key.ENTER)
        return
--------------------------------------------------------
destn_check() # Unable to find match but find text 'KERBEROSV9 1'
new_reg = findAny(Pattern("1567587221899.png").similar(0.85),Pattern("1567582102585.png").similar(0.85))
    for match in new_reg :
        match.highlight(1)
        uprint(match.text())
if hostchk == "Connectedto":
        print "Valid Host"
    else :
        wr_sheet.write(rx,34,'Invalid Host')
        type("quit" +Key.ENTER)
        return
--------------------------------------------------------

Thanks in advance.
Regards,
Nitin Chaudhari