There is no problem adding links to a page’s content.
I can not find the string mentioned. Can you send some test wp credentials in a private reply? So we can test this out and see what is happening.
The links do not disappear, they are there but are in white color. I added this code into the test page custom css box:
p a {
color: #2b9ce0 !important;
}
The link text is visible now.
To make this take effect on all site, add the same code into your Custom Css box in General Options. Change the color to your wish.
Let us know.
