Trouble with change record in GTM GUI

Hi

 

 

I have a Trouble with GTM when try to change A record via GUI

 

example

 

I have test.gtm.com A 10.10.10.10

 

When I want to change 10.10.10.10 to 10.10.10.20

 

usually I click Zonerunner >> resource record list >> test.gtm.com >> change IP into 10.10.10.20 >> click update

 

 

If GTM work properly ,... it will shown "test.gtm.com A 10.10.10.20"

 

but here it shown either "test.gtm.com A 10.10.10.10" and " test.gtm.com A 10.10.10.20 " ....(It's add another record instead update it)

 

 

Does anyone experience this ?

 

Thank you in advance