Attachment section does not appear after upload

After uploading an attachment, the entire attachment section will disappear from a project.

Please advise.

Thank you.

Successor elements, Notes, Predecessor element, linked elements also do not load

It is indeed an image file (.jpg). However I have tested with several other kinds of files (.pdf, .txt, .zip) and the same issue is occurring.

For example: in a project I have 6 attachments. I add another attachment, and the entire section will disappear.

If I refresh the page and go back to the project, I will only see the last attachment uploaded.

I clear the cache, same issue. Is there some kind of limit to how many attachments can be viewed on the page?

I am on v5.1.3

Log file on the server or in the Console?

There was no information in the server log file so here is the console info:

When deleting the one attachment from the picture in the previous post.

Synchronous XMLHttpRequest on the main thread is deprecated because of its detrimental effects to the end user's experience. For more help xhr.spec.whatwg.org/ dojo.js:15:0
Use of getAttributeNode() is deprecated. Use getAttribute() instead. dojo.js:15:0
=> 638ms | page='today.php' | destination='centerDiv' (server:552ms, client:86ms) projeqtor.js:77:3
=> 693ms | page='objectMain.php' | destination='centerDiv' (server:232ms, client:461ms) projeqtor.js:77:3
=> 768ms | page='objectDetail.php' | destination='detailDiv' | formName=listForm' (server:363ms, client:405ms) projeqtor.js:77:3
=> 90ms | page='../tool/removeAttachment.php' | destination='resultDiv' | formName=attachmentForm' | isResultMessage='true' | validationType='attachment' (server:87ms, client:3ms) projeqtor.js:77:3
Error on xhrPost return for loadContent('objectDetail.php?refreshAttachments=true&destinationWidth=693&destinationHeight=74.05'&#44; 'Project_Attachment'&#44; 'listForm'&#44; 'undefined') : <br/> RequestError: Unable to load objectDetail.php?refreshAttachments=true&destinationWidth=693&destinationHeight=74.05 status: 500 projeqtor.js:694:1
Object { message: "Unable to load objectDetail.php?ref…", stack: ".cache["dojo/errors/create"]/</</_4…", response: Object, status: 500, responseText: "<input type="hidden" id="attachment…", xhr: XMLHttpRequest } dojo.js:15:102025