There is no problem. This is how it works. Windows is supposed to detect the phone only for one second as soon as it connects.
So just follow the process.
You only need to setup everything in sp flash tools. Then click on the download button. After that connect the phone. Sp tools would already be searching for it and will detect as soon as it connects and do the need full.
Don't just say thanks, click on the thanks button. it's encouragement to do more.😀
XDA is supercool