Words: Right sounds, wrong conclusions

Hi, I’m an ELA tutor and I’ve been having this problem consistently with a couple students. They’ll be reading, and they can identify all the sounds correctly, but when it comes to actually reading the word, it’s wrong. For example: The kid will say, “t-a-ble” and then shout, “tape!” Can anyone help me understand why this is happening and how I can go about helping them understand?