One column will not sort in grid.

@mikek137, hi.. I think the grid might not be working in your case due to following reason:
Expressions which needs to be reevaluated (that are to be placed inside with()) are present inside load()
I have done a quick test and your grid is working fine after doing some minor changes. Check with the following code and let me know if you have any follow-up questions:

rule!APN_uiSectionOneColumn
(
label: "Projects Launching in the Next 30 Days",
contents: {

load(
local!gridPagingInfo: topaginginfo(1,-1),
projects: rule!GET_NEXT_30_DAYS(),
if(rule!APN_isEmpty(projects), {},
with(
projects: rule!GET_NEXT_30_DAYS(gridPagingInfo),
rule!APN_uiPagingGrid(
\tlabel:" ",
columns:{
rule!APN_uiGridTextColumn(
label: "Projected Launch Date",
data: projects.data.projectedLaunchDate,
field: "projectedLaunchDate"
),
rule!APN_uiGridTextColumn(
label: "Category",
data: projects.data.category,
field: "category"
),
rule!APN_uiGridTextColumn(
label: "Product",
data: projects.data.site,
field: "site"
),
\trule!APN_uiGridTextColumn(
label: "Title",
data: projects.data.title,
field: "title"
),
\trule!APN_uiGridTextColumn(
label: "Theme",
data: projects.data.theme,
field: "theme"
),
\trule!APN_uiGridTextColumn(
label: "Phase",
data: projects.data.phase,
field: "phase"
)

},
pagingInfo: gridPagingInfo,
totalCount: projects.totalCount
)
)
)
)
}
)

@mikek137, hi.. I think the grid might not be working in your case due to following reason:
Expressions which needs to be reevaluated (that are to be placed inside with()) are present inside load()
I have done a quick test and your grid is working fine after doing some minor changes. Check with the following code and let me know if you have any follow-up questions:

rule!APN_uiSectionOneColumn
(
label: "Projects Launching in the Next 30 Days",
contents: {

load(
local!gridPagingInfo: topaginginfo(1,-1),
projects: rule!GET_NEXT_30_DAYS(),
if(rule!APN_isEmpty(projects), {},
with(
projects: rule!GET_NEXT_30_DAYS(gridPagingInfo),
rule!APN_uiPagingGrid(
\tlabel:" ",
columns:{
rule!APN_uiGridTextColumn(
label: "Projected Launch Date",
data: projects.data.projectedLaunchDate,
field: "projectedLaunchDate"
),
rule!APN_uiGridTextColumn(
label: "Category",
data: projects.data.category,
field: "category"
),
rule!APN_uiGridTextColumn(
label: "Product",
data: projects.data.site,
field: "site"
),
\trule!APN_uiGridTextColumn(
label: "Title",
data: projects.data.title,
field: "title"
),
\trule!APN_uiGridTextColumn(
label: "Theme",
data: projects.data.theme,
field: "theme"
),
\trule!APN_uiGridTextColumn(
label: "Phase",
data: projects.data.phase,
field: "phase"
)

},
pagingInfo: gridPagingInfo,
totalCount: projects.totalCount
)
)
)
)
}
)