wiki markup save issue

When I same an edit layout after editing wiki code and re-open it I find "\" inserted before the "|" marks which then fails in preview. Also I find that some of the data isn't saved ... possibly related to the above issue.

extract of before....

| {text-data:Deliverable}{text-data} |
{text-data:Description/Example|type=area|width=300px|height=75px}{text-data} | {list-data:Tangible or Intangible|type=check}
{list-option:Tangible}Tangible{list-option}
{list-option:Intangible}Intangible{list-option}
{list-data} | {text-data:Role-delivery}{text-data} |
{text-data:Role-receiving}{text-data} | {list-data:Cost/Risk to deliver}
{list-option:Not set} 0{list-option}
{list-option:1(Low)} 1{list-option}
{list-option:2}2{list-option}
{list-option:3}3{list-option}
{list-option:4}4{list-option}
{list-option:5(High)}5{list-option}
{list-data} | {list-data:Potential value received}

after saving...

{table-data:cards}

|| Deliverable || Description/Example || Tangible/Intangible? || Role Delivering || Role Receiving || Cost/Risk(creator only) || Value Received(receiver only) || Date || Current Performance(receiver only) ||

| {text-data:Deliverable}{text-data} |
{text-data:Description/Example|type=area|width=300px|height=75px}{text-data} \| {list-data:Tangible or Intangible|type=check}
{list-option:Tangible}Tangible{list-option}
{list-option:Intangible}Intangible{list-option}
{list-data} \| {text-data:Role-delivery}{text-data} \|
{text-data:Role-receiving}{text-data} \| {list-data:Cost/Risk to deliver}
{list-option:Not set} 0{list-option}
{list-option:1(Low)} 1{list-option}
{list-option:2}2{list-option}
{list-option:3}3{list-option}
{list-option:4}4{list-option}
{list-option:5(High)}5{list-option}
{list-data} \| {list-data:Potential value received}